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Gibbs free energy is the measurement of the maximum reversible work that can be done by a system so a negative GFE change means the system performs work or loses that energy to the surroundings which makes it spontaneous. If the GFE is positive then the forward reaction will not be spontaneous because more energy needs to be added to the system to achieve whatever process is occurring.
A reaction that absorbs heat and decreases entropy results in a positive delta G which is not favorable and thus not spontaneous. If the reactants have more free energy than the products do, then you have a negative delta G. This is a favorable situation which is why it is considered spontaneous.
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